#app{
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: #5290f9;
  min-height: 100vh;
}

.drag_area{
  position: relative;
  width: 50%;
  height: 500px;
  border: 5px dashed #fff;
}

.drag_area::after,.drag_area::before{
  content: "";
  position: absolute;
  width: 50px;
  height: 5px;
  background-color: #fff;
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%);
  border-radius: 10px;

}

.drag_area::after{
  transform: translate(-50%,-50%) rotate(90deg);
}

.drag_area.enter{
  border: 5px solid rgba(0, 0, 0, .3);
}
.drag_area.enter::after,.drag_area.enter::before{
  background-color: rgba(0, 0, 0, .3);
}

.img_list{
  display: flex;
  margin-top: 20px;
}
.img_item{
  width: 100px;
  height: 100px;
  border-radius: 5px;
  overflow: hidden;
  margin-right: 10px;
}

.img_item img{
  width: 100%;
  height: 100%;
  object-fit: cover;
}